Hoisting-crane



(No Model.)

HOIS'IING CRANE.

No. 515,276. Patented Peb. 20, 1894.

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Patented Feb. 20,- 1894.

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@Nieren Sterns? Ferner @erica WILLIAM SUMTER BLACK, OF BALTIMORE, MARYLAND.

HOISTING-CRAN'E.

SPECIFICATION forming part of Letters Patent Nzo. 515,276, dated February 20, 1894. Application tiled December 6, 1893. Serial No. 492,922. (No model.)

To LZZ whom it may concern:

Beit known that LWILLIAM SUMTER BLACK, a citizen of the United States, residing at Baltimore, State of Maryland, have invented certain new and useful Improvements in Hoisting-Cranes, of which the following is a full,

clear, and exactdescription, reference being 4, 5 and 6 are details showing the lower end cap, the worm gearing and hoisting drum, and the brake lever.

My invention relates to that class of cranes particularly designed for use in packing establishments; the object being to provide a crane for this purpose which will be comparatively inexpensive, very simple in :its construction, and not liable to get out of order.

The invention will first be described, and then specifically pointed out in the claims.

A, represents the crane, formed of a vertical mast A', horizontal boom A2 and strut A3. The mast A is formed of two parallel bars a, a secured together by means of the upper and lower end caps ct a2, the lower cap a2 being provided with a pivot post or stud a3 mounted in a step bearing a4 while the upper cap a. is provided with the tubular bearing a5. VThese bearings or axes a3 a5 are placed a little to one side of the longitudinal vertical axis of the mast, as clearly shown in Fig. 3, for a purpose to be hereinafter described. The upper bearing of extends through a vertical bearing b, formed on a bracket B, the

said bracket also being formed with a horizontal tubular bearing Z9. This bracket B will be secured to the ceiling or' other support in any well known manner, and will be stationary with respect to the crane.

C, is a vertical tubular shaft extending through the bearing a5 and provided at its upper end with a bevel gear c, thelower end of the shaft being mounted in a bearing c', formed on a bracket C secured between the two members or side pieces et of the mast.

The said bracket C being also formed with a horizontal bearing c2 parallel with the boom, the lower extremity of the shaft C, is provided with a bevel gear c3 which meshes with thevbevel gear d on the inner end of the shaft D, extending through the bearing c2 and supported near its outer end in the bearings e, formed on a hanger E depending from the boom. The hanger E, between these bearings is formed with a worm-b0x e within which turns the worm D on the shaft D. The bracket E, above the Worm-box and at right angles thereto is provided with a transverse bearing e2 in which is mounted the sh aft F carryinga worm wheelF anda drum F2; the said worin wheel meshing with the worm D. A hoisting chain F3, extends from the drum outwardly along the boom over a guide pulley F4 mounted in bearings near the outer end of the boom. The front extremity of the shaft D, is provided with a grooved pulley D2 around which extends the depending endless rope or chain D3.

ds is a guide depending from the boom with its ends d4 provided with fianges d5 which cross the periphery of the pulleyD2 and prevent the endless cord or chain from slipping off.

D4 is a brake lever hinged at its inner end to the boom and provided between its ends with a shoe D5 the sides of which are beveled to engage the beveled walls of the pulley groove and the lower edge of the shoe being grooved so as to avoid contact with the endless chain or rope D3.

D is a spring normally holding the brake lever elevated.

D7 is an operating chain or cord depending from the outer end of the brake lever for pulling it down to bring its shoe in contact'with the said pulley D2. y A

The Worm and the ,worm wheel will be formed with a very coarse pitch.

G, is the driving shaft mounted-inthebearin g b of the bracket B and provided at its inner end with the bevel gear g meshing with the bevel gear c of the shaft C while the outer end of the shaft G is provided with a fast and a loose pulley y g2. The bracket B is provided with a guide arm b2 projecting beyond the gear g and provided with an aperture b3 concentric with the longitudinal axis of the shaft C, and of less diameter than the bore of the said shaft.. A similar guide arm IOO c4 is secured to the bracket C', and is also provided-with an aperture of less diameter than the bore of the shaft and concentric therewith.

I-I, is a horizontal bell-crank belt shifter pivoted at its angle to the ceiling or other support, and provided at one end with a belt loop H through which passes the belt for engaging the pulleys g g2. To the other arm of the lever I-I is secured the cord or chain I, which extends outwardly around the guide pulley i, thence inwardly over a guide pulley t', down through the guide h2, tubular shaft c and guide c4 to and around the large pulley or drum J, thence upwardly through the said guides and shaft over a pulley t2 to the said arm of the bell crank lever. The cord orchain I, is secured to the said drum or pulley J, so that when the drum or pulley is turned, it will throw the bell crank lever and cause it to shift the belt from the fast to the loose pulley or vice versa. The apertures in the guide B and C2 are made of smaller diameter than the bore of the tubular shaft C, so as to prevent the said cord or chain I, from getting into contact with the interior of the said shaft. The pulley or drum J is pivoted to the mast by means of a boltj, and is held frictionally in its adjusted position by means of the wood and leather disks l7'27'3 interposed between it and the inner face of one of the members or side pieces a of the mast.

J is a lever secured to the drum or pulley J for operating it.

When it is desired to raise an article, the hook on the lower end of the chain F3 is engaged therewith and the lever J is operated to cause the belt shifterto shift the belt from the loose to the fast pulley g whereupon the shaft G will rotate the shaft D, through the medium of the shaft C, and the shaft D by means of its worm D will rotate the worm wheel and drum in the direction of the arrow shown in Fig. l. When the article has been raised asufficient height, the lever J will be thrown in an opposite direction to throw the belt from the fast to the loose pulley and the crane may be swung in any desired position; the operator grasping the cord or chain D7 to prevent the rotation of the shaft D. To lower the article, it is simply necessary to release the brake cord or chain D7 and pull on the endless chain or cord D3 to start the shaft D when the weight of the article will cause the rotation of the drum F2 and its operating gearing in the opposite direction; the pitch of the worm gear D F being such as to permit this action.

It will be noticed that the drum and the worm wheel F lie between the two members or side pieces of the boom, and that by placing the axes of the mast to one side of the center a much wider drum can be used than if said axes were concentric with the mast as clearly shown in Fig. 3. It is evident also that by arranging the belt shifting mechanism, largely within the mast, much less room is required and a much more compact apparatus is afforded.

I desire it understood that the tubular mastaxis, tubular shaft and drive shaft may be placed at the lower end of the mast if desired; such being a mere reversal of the said'parts as shown in the drawings.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of. the United States, is-

21. The combination with a derrick, of a vertical shaft journaled in the mast, a drive shaft geared thereto, and provided with a fast and a loose pulley, a hoisting drum mounted on the boom, a shaft journaled on the boom and geared to said drum and to the said vertical shaft, a belt shifter, and an operating mechanism for said shifter mounted on the mast,l substantially as herein described.

2. The combination with the derrick having one of its axes tubular, of a tubular shaft mounted in the mast and extending through said tubular axis, a drive `shaft geared to the projecting end of said tubular shaft and provided with fast and loose pulleys,abelt shifter, operative connections for operating the said shifter extending through the said tubular shaft, and the hoisting mechanism on the boom geared to said vertical shaft, substantially as herein described.

3. The combination with the derrick having a tubular axis, of a tubular shaft mounted in the mast and extending through said tubular axis, a drive shaft geared to the projecting end of said tubular shaft, and provided with fast and loose pulleys, abelt shifting lever, guides adjacent to the ends of the tubular shaft, a pulley or drum mounted on the mast, a iiexible connection extending therefrom, through said guides and tubular shaft to the belt shifting lever to throw it in either direction said guides holding the flexible connection out of contact with said tubular shaft, guide pulleys for said flexible connection,

land a hoisting drum on the boom and geared to the said tubular shaft, substantially as herein described. v

4. The combination with the derrick having one of its axes tubular, a shaft mounted on the mast and extending through the said tubular axis, a drive shaft geared to the projecting end of said shaft and provided with fast and loose pulleys, a belt shifting mechanism, a shaft mounted on the boom, and geared to said vertical shaft, and provided with a coarse worm wheel and with a fixed pulley over which passes a depending endless rope or chain, and a hoisting drum on the boom and provided with a coarse worm wheel meshing with said worm, substantially as herein described.

5. The combination with the derrick having one of its axes tubular, a shaft mounted in IIS the mast and extending through said tubular axis, a drive shaft geared to `the projecting end of said shaft and provided with'a belt shifting mechanism, a worm shaft journaled on the boom and geared to the mast shaft, a worm Wheel geared to said Worm shaft, a hoisting drum operated thereby, a fixed pulley on the outer end of the Worm shaft, and provided with a depending endless rope or chain, and a brake lever for said fixed pulley, substantially as herein described.

6. The combination with the derriek, of the hoisting drum on the boom thereof, the Worm shaft geared thereto and provided with a fixed pulley, a driving mechanism foroperating the worm shaft, a depending endless rope or chain for the said pulley, a guide secured to the boom and extending at opposite sides of the pulley to prevent displacement of its endless operative rope or chain, and a spring retracted brake lever having a shoe engaging said pulley, substantially as herein described.

7. The combination with the derrick having one tubular axis, a tubular shaft extending through said axis, a drive shaft geared to the projecting end of said shaft, and having a fast anda loose pulley, a belt shifting lever, and the'hoisting mechanism mounted on the boom and operated from said tubular shaft,

of the frictionally held drum or pulley on the mast, the friction disks between the drum or pulley and the adjacent face of the mast, and the flexible operative connection extending from said pulley or drum through the tubular shaft to the belt shifter, substantially as herein described. ,A

8. The hoisting apparatus comprising the mast A provided with end caps having respectively a tubular and a non-tubular axis eccentric to the longitudinal vertical axis of said mast, the tubular shaft extending through the tubular axis, the drive shaft having a fast and a loose pulley, and geared to the projecting end of said tubular shaft, a belt shifter, operative connections therefrom extending through the tubular shaft, a Worm shaft on the boom and geared to the tubular shaft, and a hoisting drum on the boom, geared to the worm shaft, substantially as herein described.

WILLIAM SUMTER BLACK. Witnesses:

GEORGE S. BooKER,

CHARLES E. GARITEE. 

